90 degree tach drive coupling
Thread Starter
Cruising
Joined: Aug 2010
Posts: 13
Likes: 0
From: Auburn New Hampshire
90 degree tach drive coupling
I own a 74 Corvette that had a tach cable problem. I ordered a new cable and a 90 degree adapter to change direction of connection to distributer. After hooking all up the tach did not work. It took about 45 minutes to figure out the adapter was turning the wrong way. I switched the drive side of the adapter to the grease fitting side. Now the cable was turning correctly and tach worked. Supplier said he never heard of this and had no other complaints from other customers. Has anyone else had this problem or ideas why I had to change direction of adapter. . Baffled Don
Racer
Joined: Jun 2011
Posts: 383
Likes: 21
From: Greenville Ohio
From the advice given here, I would get rid of the 90 degree adapter and re-clock the distributor. The adapter is known to cause a lot more problems with the distributor which may require machine work to fix. Search the threads here and find the instructions on how to re-clock the distributor. I'm assuming your old tach cable broke due to the sharp bend coming out the distributor, re-clocking it will fix this problem.
Eric
Eric
Last edited by edk136; Sep 5, 2013 at 08:03 PM.
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
My car had one of those on it, just seems to put un-needed load on the gears.
Probably not enough to make much difference being how little this gets driven but I pulled the dizzy and re-indexed, (also needed to help the timing, vac-can was hitting the intake)
M
